Clamping means for rotary members



. SHANNON.

CLAMPIN FOR ROTARY ME 8.

APP FILED JAN-24, 192

Patented Oct. 4, 1921'.

IrTvErTT 012 WW OFFICE.

PATENT n-nwrnrpsirniviv on, or LOC'KLAND, 01110.

i CLAMIE'ING MEANS FOR ROTARY MEMBERsf Specification of Letters Patent. Patented Oct. 4:, 1921.

Application fil ed J nuar 24, 1920. Serial no. 353,774.

To. all whom it may 50mm Be it known that I, EDWIN P. SHANNON, a citizen of the United States, and'a resident of Lockland, in the county of Hamilton and State of Ohio, have invented a certain new andus'eful Clamping Means for Rotary Members; .and I do hereby declare the following to be a full, clear, and exact description of the "invention, such as will' enable others skilled inthe art'to which it ap'pertains to make and ,use the same, refer ence being had to the accompanying draw ings, and to the Icl iaracters of, reference marked thereon, hi h form o t Specification. v i

This inventlon relates particularly to means for clamping rotary members, such for instance, asgrinding orpolish ing wheel's, rotary saw and slitter blades, and the like; and has for its primary object the provision of a clamping means of this character which has its members relatively turnable on a carrying shaft or means to effect a tool clamping or releasing action of the clamping members, the turning of the members or either of them, to effect a gripping of a tool, being accomplished by a movement thereof reverse to the intended direction of driving of the shaft, the resistance offered to a turn ing of the tool by the work being acted on tending to effect a firmer clamping of the I clamping members on the tool.

Further objects and advantages of the invention will be apparent from the following detailed description thereof.

While the invention in its broader aspect is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which,

Figure 1 is a side elevation of an apparatus embodying the invention in workclamping relation on a shaft and with a portion in central section longitudinally of the shaft. Fig. 2 is an end elevation thereof with the shaft in section and with a portion of the clamping member broken away,

and Fig. 3 is a section on the line 3-3 in Fig. 1. I

Referring to the drawings, 1 designates a shaft, and 2 and 3 a pair of work clamping members mounted for rotary and axial movements on the shaft and adapted to clamp a tool 1 between their adjacent ends. The hub or sleeve portions of the, clamping members are providedinternally with spiral grooves or threads 5 with the groove 01' thread of one reverse to that of the other, or one forming a right and the other a left hand thread. The shaft is provided within each clamping member with one or more pins or studs'6'projecting into the thread of the respective member so that a turning ofthe members relative to the shaft will impart movements to the members longitudinally of the shaft. It is evident that by reversing the forms of the threads on the two clamping members, the members when turned in one direction relative to the shaft will be caused to have a receding or operating movement, and when turnedin the opposite direction relative to the shaft will be caused to have a clamping movement toward-each other.

The direction of tool clamping rotation of the clamping membersshould be opposed to the normal direction of driving of the shaft 1, so that anyresistance which is offered to a turning ofthe tool 4' and engaged clamping members by the coaction of work with the tool will tend to effect a tightening of the clamping members on the tool rather than a loosening movement thereof relative to the shaft.

One or both of the clamping members may be provided with a set screw 7 for locking the member in adjusted position to the shaft, and in practice it is preferable to provide one .of the clamping members with an adjusting screw 8, which is threaded through its hub or sleeve portion in tangential relation'to a circle concentric to the hub axis and adapted to have thrust engagement at its inner end with a shoulder 9 formed by one side of a recess provided in the shaft 1, whereby an inward turning of the screw will effect a tightening of the clamping member with respect to its companion.

The clamping members 2 and 3 may be secured in clamping relation to a tool 4 by a pin 10 inserted through registering openings in the coacting inner flanged ends of the clamping members. A proper registering of the pin receiving openings in the clamping members to receive the pin when the members are in proper tool clamping position, may be obtained by tightening the members to the extent desired against atool being held thereby and then drilling a hole through the flange portions of the two members and inserting the pin- 10 therein.

If a worn or broken tool 4 is replaced by another of the same size and style, the pin receiving holes in the two members will ordinariljy; be brought into register when the mem ers are in proper clamping relation to the tool. In releasin the clamping memhere from the tool it 1s only necessary to turn one clamping member on the shaft relative to the other'clamping member so that the clamping position of the other, or stationary member, need not be disturbed.

It'is evident that I have provided a simple and efficient clamping means for use in connection with shafts to hold a tool in engagement therewith and that it may be easily operated to effect a clamping or releasing of the tool.

The tool 4 if desired, may be provided with dowel pins 11 for seating in sockets inone or the other of themembers, this arrangement being particularly desirable when a sectional tool is provided, the dowel pins then serving to retain the sections in assembled relation and resisting an outward throwing of the same when being rotated at hi 'h speed. I

I wish it understood that my invention is not limited to any specific construction, arrangement or form of the parts, as it is capable of numerous modifications and changes without departing from the spirit of: the

claims. 7

Having thus described my invention, what the threads offthe respective collars to cause i the collars to have axial opposed movements 7 when rotated in the same direction on the shaft, and means for lockin the collars in adjusted relation to the sha p y r 2. In combination, a shaft, a pair 'of collars fitted for turning movements on the.

shaft, and having their adjacent ends adapted to grip a tool therebetween, each collar having an internal thread with the thread of one collar reverse to that of the other, a pin fixedl projecting; from the shaft within each co lar and entering a thread thereof whereby opposed axial movements areimparted to the collars when turned in the same direction relative tov the shaft, and

means for locking the shaft in adjusted relation. V

In testimony whereof I have hereunto signed my name to this specification.

EDWIN P. SHANNON. 

